Plastic optical lens assembly, imaging lens module and electronic device

ABSTRACT

A plastic optical lens assembly includes a first lens element, a second lens element and a cementing glue coating. A first spacing section is located between a first optical effective portion and a first engaging structure. A second optical effective portion is disposed correspondingly to the first optical effective portion. A second spacing section is located between the second optical effective portion and a second engaging structure. The first engaging structure is engaged with the second engaging structure. A reference space is between the first and the second spacing section. The cementing glue coating is at least disposed between the first and the second optical effective portions, and the first and the second lens elements are cemented by the cementing glue coating.

RELATED APPLICATIONS

The present application is a divisional of the application Ser. No.16/674,255, filed Nov. 5, 2019, which is a continuation of theapplication Ser. No. 15/465,786, filed Mar. 22, 2017, now U.S. Pat. No.10,502,932 issued on Dec. 10, 2019, and claims priority to TaiwanApplication Serial Number 105136313, filed Nov. 8, 2016, which is hereinincorporated by reference.

BACKGROUND Technical Field

The present disclosure relates to a plastic optical lens assembly and animaging lens module. More particularly, the present disclosure relatesto a plastic optical lens assembly and an imaging lens module applied toportable electronic devices.

Description of Related Art

Along with the popularization of personal electronic products and mobilecommunication products (such as mobile phones and tablets) havingimaging devices, miniaturized imaging lens modules have beencorrespondingly risen and developed, and the demands of miniaturizedimaging lens modules having high resolution and great image qualitysignificantly increased as well.

To satisfy the optical specification of the plastic optical lensassembly in the imaging lens modules, cemented lens element is oftenincorporated into the plastic optical lens assembly. However, themanufacturing process of the cemented lens element is more complicatedthan non-cemented lens element, and a curve with high accuracy is neededat the cementing surface between two lens elements to achieve hightightness at the time the two lens elements are cemented. Meanwhile,during the process of cementing, the tightness may be poor because ofoffsets, and hence the overall optical image quality is affected. Forthose cemented lens element applied to miniaturized imaging lens modulewith high optical specification (such as having pixels over 13 megapixels, aperture value over 1.8, optical image stabilization (OIS),double zoom lens, etc.) the demand of the aligning precision will bestricter. Therefore, a plastic optical lens assembly promoting thetightness and aligning precision of cemented lens element is urgentlyneeded to maintain the image quality and be applicable to the imaginglens module with high optical specification.

SUMMARY

According to one aspect of the present disclosure, a plastic opticallens assembly including a first lens element, a second lens element, anda cementing glue coating is proposed. The first lens element includes afirst surface, wherein the first surface includes a first opticaleffective portion and a first peripheral portion. The first peripheralportion surrounds the first optical effective portion, wherein the firstperipheral portion includes a first spacing section and a first engagingstructure, and the first spacing section is located between the firstoptical effective portion and the first engaging structure. The secondlens element includes a second surface, wherein the second surfaceincludes a second optical effective portion and a second peripheralportion. The second optical effective portion is disposedcorrespondingly to the first optical effective portion. The secondperipheral portion surrounds the second optical effective portion,wherein the second peripheral portion includes a second spacing sectionand a second engaging structure, the second spacing section is locatedbetween the second optical effective portion and the second engagingstructure, the first engaging structure is engaged with the secondengaging structure for aligning the first optical effective portion withthe second optical effective portion, and a reference space is formedbetween the first spacing section and the second spacing section. Thecementing glue coating is at least disposed between the first opticaleffective portion and the second optical effective portion, and thecementing glue coating cements the first lens element and the secondlens element.

According to another aspect of the present disclosure, an image lensmodule including the aforementioned plastic optical lens assembly and animage sensor is proposed, wherein the image sensor is disposed on animage surface of the plastic optical lens assembly.

According to another aspect of the present disclosure, an electronicdevice including the aforementioned image lens module is proposed.

According to another aspect of the present disclosure, a plastic opticallens assembly including a first lens element, a second lens element, anda cementing glue coating is proposed. The first lens element includes afirst surface, wherein the first surface includes a first opticaleffective portion and a first peripheral portion. The first peripheralportion surrounds the first optical effective portion, wherein the firstperipheral portion includes a first plane section and a first engagingstructure, and the first plane section is perpendicular to an opticalaxis of the plastic optical lens assembly and is located between thefirst optical effective portion and the first engaging structure. Thesecond lens element includes a second surface, wherein the secondsurface includes a second optical effective portion and a secondperipheral portion. The second optical effective portion is disposedcorrespondingly to the first optical effective portion. The secondperipheral portion surrounds the second optical effective portion,wherein the second peripheral portion comprises a second plane sectionand a second engaging structure, the second plane section isperpendicular to the optical axis and is located between the secondoptical effective portion and the second engaging structure, the firstengaging structure is engaged with the second engaging structure foraligning the first optical effective portion with the second opticaleffective portion, and a reference gap is formed between the first planesection and the second plane section. The cementing glue coating is atleast disposed between the first optical effective portion and thesecond optical effective portion, and the cementing glue coatingcementing the first lens element and the second lens element. When adiameter of a width midpoint of one of the first plane section and thesecond plane section having a narrower width is ϕd, an outer diameter ofthe cementing glue coating is ϕt, the following condition is satisfied:0.08 mm<(ϕd−ϕt)/2<ϕt mm.

According to another aspect of the present disclosure, an image lensmodule including the aforementioned plastic optical lens assembly and animage sensor is proposed, wherein the image sensor is disposed on animage surface of the plastic optical lens assembly.

According to another aspect of the present disclosure, an electronicdevice including the aforementioned image lens module is proposed.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading thefollowing detailed description of the embodiment, with reference made tothe accompanying drawings as follows:

FIG. 1A is a schematic view of an imaging lens module according to the1st embodiment of the present disclosure;

FIG. 1B is a schematic view of assembling the first lens element and thesecond lens element according to the 1st embodiment;

FIG. 10 is a schematic view of a parameter 2 a of the plastic opticallens assembly according to the 1st embodiment;

FIG. 1D is a schematic view of parameters ϕd, ϕt, d, and t of theplastic optical lens assembly according to the 1st embodiment;

FIG. 2A is a schematic view of an imaging lens module according to the2nd embodiment of the present disclosure;

FIG. 2B is a schematic view of assembling the first lens element and thesecond lens element according to the 2nd embodiment;

FIG. 2C is a schematic view of a parameter 2 a of the plastic opticallens assembly according to the 2nd embodiment;

FIG. 2D is a schematic view of parameters ϕd, ϕt, d, t, and m of theplastic optical lens assembly according to the 2nd embodiment;

FIG. 3A is a schematic view of an imaging lens module according to the3rd embodiment of the present disclosure;

FIG. 3B is a schematic view of assembling the first lens element and thesecond lens element according to the 3rd embodiment;

FIG. 3C is a schematic view of a parameter 2 a of the plastic opticallens assembly according to the 3rd embodiment;

FIG. 3D is a schematic view of parameters ϕd, ϕt, d, and t of theplastic optical lens assembly according to the 3rd embodiment;

FIG. 4A is a schematic view of an imaging lens module according to the4th embodiment of the present disclosure;

FIG. 4B is a schematic view of assembling the first lens element and thesecond lens element according to the 4th embodiment;

FIG. 4C is a schematic view of a parameter 2 a of the plastic opticallens assembly according to the 4th embodiment;

FIG. 4D is a schematic view of parameters ϕd, ϕt, d, and t of theplastic optical lens assembly according to the 4th embodiment;

FIG. 4E is another schematic view of the imaging lens module accordingto the 4th embodiment of the present disclosure;

FIG. 4F is a schematic view of assembling the first lens element and thesecond lens element according to the 4th embodiment

FIG. 4G is another schematic view of a parameter 2 a of the plasticoptical lens assembly according to the 4th embodiment;

FIG. 4H is another schematic view of parameters ϕd, ϕt, d, and t of theplastic optical lens assembly according to the 4th embodiment and aschematic view of a parameter m;

FIG. 5A is a schematic view of an electronic device of the 5thembodiment of the present disclosure;

FIG. 5B is another schematic view of the electronic device of the 5thembodiment of the present disclosure;

FIG. 5C is a block diagram of the electronic device of the 5thembodiment;

FIG. 6 is a schematic view of an electronic device according to the 6thembodiment of the present disclosure; and

FIG. 7 is a schematic view of an electronic device according to the 7thembodiment of the present disclosure.

DETAILED DESCRIPTION 1st Embodiment

FIG. 1A is a schematic view of an imaging lens module 100 according tothe 1st embodiment of the present disclosure. In FIG. 1A, the imaginglens module 100 includes a plastic optical lens assembly 109 and animage sensor 107, wherein the plastic optical lens assembly 109 includesa first lens element 110, a second lens element 120, and a cementingglue coating 190. The image sensor 107 is disposed on an image surface156 of the plastic optical lens assembly 109.

In the 1st embodiment, the plastic optical lens assembly 109 includes,in order from an object side to an image side, lens elements 133, 134,135, 136, the first lens element 110, the second lens element 120, aglass panel 155, and the image surface 156, wherein the plastic opticallens assembly 109 has six lens elements (i.e., the lens elements 133,134, 135, 136, the first lens element 110, and the second lens element120), and all of the six lens elements are plastic materials. Thecementing glue coating 190 cements the first lens element 110 and thesecond lens element 120, and all of the lens elements 133, 134, 135,136, the first lens element 110, the second lens element 120, and theglass panel 155 are disposed inside the plastic barrel 108 along anoptical axis of the plastic optical lens assembly 109. In addition, theglass panel 155 can be a cover glass element, a filter, or both, andwill not affect the focal length of the plastic optical lens assembly109. In other embodiments (not shown), a plastic optical lens assemblycan have four, five, six, seven, or more lens elements.

FIG. 1B is a schematic view of assembling the first lens element 110 andthe second lens element 120 according to the 1st embodiment. In FIG. 1Aand FIG. 1B, the first lens element 110 includes a first surface 113.The first surface 113 includes a first optical effective portion 114 anda first peripheral portion 115, wherein the first peripheral portion 115surrounds the first optical effective portion 114. The second lenselement 120 includes a second surface 123. The second surface 123includes a second optical effective portion 124 and a second peripheralportion 125, wherein the second optical effective portion 124 isdisposed correspondingly to the first optical effective portion 114, andthe second peripheral portion 125 surrounds the second optical effectiveportion 124. In the 1st embodiment, the first surface 113 is the surfaceof the first lens element 110 facing the image surface 156, and thefirst optical effective portion 114 is concave in a paraxial regionthereof. The second surface 123 is the surface of the second lenselement 120 facing an imaged object (not shown), and the second opticaleffective portion 124 is convex in a paraxial region thereof.

FIG. 10 is a schematic view of a parameter 2 a of the plastic opticallens assembly 109 according to the 1st embodiment. In FIG. 1A and FIG.10 , the cementing glue coating 190 is at least disposed between thefirst optical effective portion 114 and the second optical effectiveportion 124, and the cementing glue coating 190 cements the first lenselement 110 and the second lens element 120. That is, the first lenselement 110 and the second lens element 120 are cemented to form acemented lens element via at least cementing the first optical effectiveportion 114 and the second optical effective portion 124.

Specifically, in FIG. 1A and FIG. 1B, the first peripheral portion 115can include a first spacing section 116 and a first engaging structure171. The first spacing section 116 is located between the first opticaleffective portion 114 and the first engaging structure 171. The secondperipheral portion 125 can include a second spacing section 126 and asecond engaging structure 172. The second spacing section 126 is locatedbetween the second optical effective portion 124 and the second engagingstructure 172, wherein the first engaging structure 171 is engaged withthe second engaging structure 172 for aligning the first opticaleffective portion 114 with the second optical effective portion 124. Tobe more specific, a center of the first optical effective portion 114and a center of the second optical effective portion 124 are aligned viathe first engaging structure 171 and the second engaging structure 172.A reference space 180 is formed between the first spacing section 116and the second spacing section 126, wherein the reference space 180 isan air gap between the first spacing section 116 and the second spacingsection 126.

In other words, the first peripheral portion 115 can include the firstplane section 117 and the first engaging structure 171. The first planesection 117 is perpendicular to the optical axis of the plastic opticallens assembly 109 and is located between the first optical effectiveportion 114 and the first engaging structure 171. The second peripheralportion 125 can include the second plane section 127 and the secondengaging structure 172. The second plane section 127 is perpendicular tothe optical axis and is located between the second optical effectiveportion 124 and the second engaging structure 172, wherein the firstengaging structure 171 is engaged with the second engaging structure 172for aligning the first optical effective portion 114 with the secondoptical effective portion 124, and a reference gap 188 is formed betweenthe first plane section 117 and the second plane section 127, whereinthe reference gap 188 is an air gap between the first plane section 117and the second plane section 127.

Accordingly, the tightness and the aligning precision of the cementedlens element formed by the first lens element 110 and the second lenselement 120 can be enhanced, and the image quality of the plasticoptical lens assembly 109 can be maintained and applicable to theimaging lens module 100 with high optical specification. Further, sincethe imaging lens module 100 includes the plastic optical lens assembly109, the plastic optical lens assembly 109 will be helpful for theimaging lens module 100 to maintain the image quality and satisfy highoptical specification.

FIG. 1D is a schematic view of parameters ϕd, ϕt, d, and t of theplastic optical lens assembly 109 according to the 1st embodiment. InFIG. 1D, when a diameter of a width midpoint of one of the first planesection 117 and the second plane section 127 having a narrower width isϕd, and an outer diameter of the cementing glue coating 190 is ϕt, thefollowing condition can be satisfied: 0.08 mm<(ϕd−ϕt)/2<ϕt mm, whereinthe outer diameter of the cementing glue coating 190 is the outerdiameter cementing the first lens element 110 and the second lenselement 120 without the overflowed part of the cementing glue coating190 merely attaching one of the first lens element 110 and the secondlens element 120. Through the reference gap 188 between the first planesection 117 and the second plane section 127, the application range ofthe cementing glue coating 190 can be prevented from being overlyextended or too small. Preferably, the following condition can besatisfied: 0.16 mm<ϕd−ϕt<ϕt mm. Accordingly, the reference gap 188 willnot be too far away from the outer diameter of the cementing gluecoating 190. In the 1st embodiment, both of the first plane section 117and the second plane section 127 surround the optical axis and areperpendicular to an annular surface of the optical axis. The one of thefirst plane section 117 and the second plane section 127 having ashorter annular width is the first plane section 117. A width midpointof the first plane section 117 forms a circle that regards the opticalaxis as a center, and the diameter thereof is ϕd.

Specifically, in FIG. 1B, during the assembling process of cementing thefirst lens element 110 and the second lens element 120 with thecementing glue coating 190, the first lens element 110 is firstly placedon a lens platform (not shown) with the first surface 113 facing anupward direction. Next, a non-solid cementing glue 199 whose volume hasbeen estimated is injected as a single drop to the center of the firstoptical effective portion 114. The second lens element 120 is engagedwith the second engaging structure 172 via the first engaging structure171 with the second surface 123 facing a downward direction, such thatthe non-solid cementing glue 199 compressed by the first lens element110 and the second lens element 120 radially spreads to the directionsof the first peripheral portion 115 and the second peripheral portion125 from the center of the first optical effective portion 114 and thecenter of the second optical effective portion 124. The non-solidcementing glue 199 subsequently hardens to be the cementing glue coating190 cementing the first lens element 110 and the second lens element120, such that the first lens element 110 and the second lens element120 are cemented with each other to form a cemented lens element.Further, via injecting the non-solid cementing glue 199 of the 1stembodiment as a single drop to the center of the first optical effectiveportion 114, bubbles of the hardened cementing glue coating 190 can beeffectively reduced, and the tightness and aligning precision of thecemented lens element can be further enhanced to maintain the imagequality of the plastic optical lens assembly 109 better. In otherembodiments (not shown), the non-solid cementing glue 199 can beinjected between the first surface 113 and the second surface 123 inmultiple drops, which is not limited thereto. Moreover, the non-solidcementing glue 199 and the cementing glue coating 190 hardened therefromare adhesives whose materials are not limited, and the viscosity of thenon-solid cementing glue 199 can be adjusted based on the requirement ofthe structure of the cemented lens element and the assembling process.

In FIG. 1B and FIG. 10 , the first engaging structure 171 can include afirst conical surface 181 and a first abutting area 191. The firstconical surface 181 is a conical annular surface regarding the opticalaxis as the central line. The first abutting area 191 is perpendicularto the optical axis and is farther away from the first optical effectiveportion 114 than the first conical surface 181 is thereto. The secondengaging structure 172 can include a second conical surface 182 and asecond abutting area 192. The second conical surface 182 is a conicalannular surface regarding the optical axis as the central line. Thesecond abutting area 192 is perpendicular to the optical axis and isfarther away from the second optical effective portion 124 than thesecond conical surface 182 is thereto. The first conical surface 181 iscontacted with the second conical surface 182, and the first abuttingarea 191 is contacted with the second abutting area 192 to engage thefirst engaging structure 171 with the second engaging structure 172 foraligning the first optical effective portion 114 with the second opticaleffective portion 124. Through the way of the first conical surface 181engaging with the second conical surface 182, the lens elements with thesame dimensional tolerance will be assembled easily, the possibility ofassembling waste can be effectively reduced, and the manufacturing costcan be further reduced. Furthermore, there are no optical elementsbetween the first conical surface 181 and the second conical surface182, and the first conical surface 181 is physically contacted with thesecond conical surface 182; there are no optical elements between thefirst abutting area 191 and the second abutting area 192, and the firstabutting area 191 is physically contacted with the second abutting area192, such that the offset of the aligning precision can be effectivelyreduced. Moreover, the first conical surface 181, the second conicalsurface 182, the first abutting area 191, and the second abutting area192 can be coated surfaces.

In FIG. 1B, when an angle between the first conical surface 181 and thefirst abutting area 191 is θ, wherein the parameter θ is ranged between0 degrees and 180 degrees, the following condition can be satisfied: 90degrees≤θ≤130 degrees. Accordingly, the distance between the first lenselement 110 and the second lens element 120 can be ensured to obtainexpected controls to maintain better optical accuracy. Preferably, thefollowing condition can be satisfied: 100 degrees≤θ≤120 degrees. In the1st embodiment, an angle between the first conical surface 182 and thesecond abutting area 192 is the same as the parameter θ for aligning thefirst engaging structure 171 being engaged with the second engagingstructure 172, and the first optical effective portion 114 with thesecond optical effective portion 124.

In FIG. 1A and FIG. 10 , in the 1st embodiment, the first spacingsection 116 can include the first plane section 117 which isperpendicular to the optical axis. The second spacing section 126 caninclude the second plane section 127 which is perpendicular to theoptical axis. Further, the reference space 180 can include the referencegap 188. Accordingly, except the first plane section 117 and the secondplane section 127 can be a buffer space of the overflowed cementing gluecoating 190, the reference gap 188 formed between the first planesection 117 and the second plane section 127 can be a space availablefor the mechanism between the first lens element 110 and the second lenselement 120 to facilitate the design margin of the structure of thecemented lens element.

In FIG. 1B and FIG. 10 , at least one of the first spacing section 116and the second spacing section 126 can include an annular groove 160which corresponds to the near surface recess thereof. In other words,the annular groove 160 is included between the first optical effectiveportion 114 and the first plane section 117 and/or between the secondoptical effective portion 124 and the second plane section 127.Accordingly, the annular groove 160 can be used as a buffer space of theoverflowed cementing glue coating 190 to receive the cementing gluecoating 190 overflowed from the first optical effective portion 114 andthe second optical effective portion 124 and to further prevent thecementing glue coating 190 from overflowing to the first conical surface181 and the second conical surface 182 to affect the aligning precisionof assembling the cemented lens element. In the 1st embodiment, thefirst spacing section 116 includes the annular groove 160. In otherembodiments (not shown), the second spacing section can include anannular groove, or both of the first spacing section and the secondspacing section can include an annular groove.

When a roughness of the annular groove 160 is Ra, the followingcondition can be satisfied: 0.1 μm<Ra<4.0 μm. Accordingly, theefficiency for absorbing the redundant non-solid cementing glue 199 canbe enhanced while reducing the stray light reflection as well.

The first plane section 117 can be connected with the first conicalsurface 181, and the first conical surface 181 can be connected with thefirst abutting area 191. That is, only one conical surface is betweenthe first plane section 117 and the first abutting area 191, and noother conical surfaces are continuously connected therebetween.Accordingly, the structural complexity of the cemented lens element canbe reduced, and the dimensional accuracy of the structure of thecemented lens element can be enhanced. In the 1st embodiment, the firstplane section 117 is connected with the first conical surface 181, andthe first conical surface 181 is connected with the first abutting area191. The second plane section 127 is connected with the second conicalsurface 182, and the second conical surface 182 is connected with thesecond abutting area 192.

In FIG. 1A and FIG. 10 , both of the first plane section 117 and thesecond plane section 127 can have no contact with the cementing gluecoating 190. Accordingly, the reference gap 188 formed between the firstplane section 117 and the second plane section 127 can be used as aspace available for the mechanism between the first lens element 110 andthe second lens element 120 for further preventing the cementing gluecoating 190 from overflowing to the first conical surface 181 and thesecond conical surface 182 to affect the aligning precision ofassembling the cemented lens element. In the 1st embodiment, both of thefirst plane section 117 and the second plane section 127 have no contactwith the cementing glue coating 190.

In FIG. 1D, both of the first plane section 117 and the second planesection 127 are perpendicular to the optical axis, and hence the firstplane section 117 and the second plane section 127 are parallel to eachother. When a distance between the first plane section 117 and thesecond plane section 127 is d, i.e., the gap width of the reference gap188, the following condition can be satisfied: 0.002 mm<d<0.06 mm.Accordingly, the accuracy of the reference gap 188 between the firstplane section 117 and the second plane section 127 can be enhanced whilepreventing the tolerance from being too large to ensure thecompatibility of the optical elements (e.g., light blocking sheets)within the reference gap 188, and the optical quality of the plasticoptical lens assembly 109 can be prevented from being affected by theoverly shaken optical elements within the reference gap 188.

When the distance between the first plane section 117 and the secondplane section 127 is d, and a thickness of the cementing glue coating190 on the optical axis is t, the following condition can be satisfied:0.25<d/t<4.0. Accordingly, the parameters d and t being closer to eachother facilitate to stably control the usage of the non-solid cementingglue 199 to consistently maintain the distances between the first lenselement 112 and the second lens element 120 before and after cementingthe first lens element 110 and the second lens element 120. Preferably,the following condition can be satisfied: 0.40<d/t<3.0.

In FIG. 10 , an area on a cross section where the reference space 180 iscoplanar with the optical axis is 2 a, wherein there are two separateareas on the cross section where the reference space 180 is coplanarwith the optical axis, and the total area thereof is 2 a. Thus, when anaverage area of each of the areas is a, the following condition can besatisfied: 0.02 mm²<2a<0.6 mm². By the reference space 180, thephenomenon of the non-solid cementing glue 199 overflowing for thecapillary effect can be reduced, and the plastic optical lens assembly109 can be maintained miniaturized.

Please refer to the following Table 1, which lists the data definedbased on the aforementioned parameters of the plastic optical lensassembly 109 of the imaging lens module 100 of the 1st embodiment asillustrated in FIG. 1B to FIG. 1D.

TABLE 1 1st embodiment Φd (mm) 5.07 Ra (μm) 0.4-0.56 Φt (mm) 3.59 d (mm)0.027 (Φd − Φt)/2 (mm) 0.740 t (mm) 0.03 Φd − Φt (mm) 1.480 d/t 0.900 θ(degrees) 110 2a (mm²) 0.2884

2nd Embodiment

FIG. 2A is a schematic view of an imaging lens module 200 according tothe 2nd embodiment of the present disclosure. In FIG. 2A, the imaginglens module 200 includes a plastic optical lens assembly 209 and animage sensor 207, wherein the plastic optical lens assembly 209 includesa first lens element 210, a second lens element 220, and a cementingglue coating 290. The image sensor 207 is disposed on an image surface256 of the plastic optical lens assembly 209.

In the 2nd embodiment, the plastic optical lens assembly 209 includes,in order from an object side to an image side, the first lens element210, the second lens element 220, lens elements 233, 234, 235, 236, aglass panel 255, and the image surface 256, wherein the plastic opticallens assembly 209 has 6 lens elements (i.e., the first lens element 210,the second lens element 220, the lens elements 233, 234, 235, 236), andall of the six lens elements are plastic materials. The cementing gluecoating 290 cements the first lens element 210 and the second lenselement 220, and all of the first lens element 210, the second lenselement 220, the lens elements 233, 234, 235, and 236 are disposedinside the plastic barrel 208 along an optical axis of the plasticoptical lens assembly 209. In addition, the glass panel 255 can be acover glass element, a filter, or both, and will not affect the focallength of the plastic optical lens assembly 209.

FIG. 2B is a schematic view of assembling the first lens element 210 andthe second lens element 220 according to the 2nd embodiment. In FIG. 2Aand FIG. 2B, the first lens element 210 includes a first surface 213.The first surface 213 includes a first optical effective portion 214 anda first peripheral portion 215, wherein the first peripheral portion 215surrounds the first optical effective portion 214. The second lenselement 220 includes a second surface 223. The second surface 223includes a second optical effective portion 224 and a second peripheralportion 225, wherein the second optical effective portion 224 isdisposed correspondingly to the first optical effective portion 214, andthe second peripheral portion 225 surrounds the second optical effectiveportion 224. In the 2nd embodiment, the first surface 213 is the surfaceof the first lens element 210 facing the image surface 256, and thefirst optical effective portion 214 is concave in a paraxial regionthereof. The second surface 223 is the surface of the second lenselement 220 facing an imaged object (not shown), and the second opticaleffective portion 224 is a convex in a paraxial region thereof.

FIG. 2C is a schematic view of a parameter 2 a of the plastic opticallens assembly 209 according to the 2nd embodiment. In FIG. 2A and FIG.2C, the cementing glue coating 290 is disposed between the first opticaleffective portion 214 and the second optical effective portion 224, andthe cementing glue coating 290 cements the first lens element 210 andthe second lens element 220. That is, the first lens element 210 and thesecond lens element 220 are cemented to form a cemented lens element viacementing the first optical effective portion 214 and the second opticaleffective portion 224.

Specifically, in FIG. 2A and FIG. 2B, the first peripheral portion 215includes a first spacing section 216 and a first engaging structure 271.The first spacing section 216 is located between the first opticaleffective portion 214 and the first engaging structure 271. The secondperipheral portion 225 includes a second spacing section 226 and asecond engaging structure 272. The second spacing section 226 is locatedbetween the second optical effective portion 224 and the second engagingstructure 272, wherein the first engaging structure 271 is engaged withthe second engaging structure 272 for aligning the first opticaleffective portion 214 with the second optical effective portion 224, anda reference space 280 is formed between the first spacing section 216and the second spacing section 226, wherein the reference space 280 isan air gap between the first spacing section 216 and the second spacingsection 226.

In other words, the first peripheral portion 215 includes the firstplane section 217 and the first engaging structure 271. The first planesection 217 is perpendicular to the optical axis of the plastic opticallens assembly 209 and is located between the first optical effectiveportion 214 and the first engaging structure 271. The second peripheralportion 225 includes the second plane section 227 and the secondengaging structure 272. The second plane section 227 is perpendicular tothe optical axis and is located between the second optical effectiveportion 224 and the second engaging structure 272, wherein the firstengaging structure 271 is engaged with the second engaging structure 272for aligning the first optical effective portion 214 with the secondoptical effective portion 224, and a reference gap 288 is formed betweenthe first plane section 217 and the second plane section 227, whereinthe reference gap 288 is an air gap between the first plane section 217and the second plane section 227.

FIG. 2D is a schematic view of parameters ϕd, ϕt, d, t, and m of theplastic optical lens assembly 209 according to the 2nd embodiment. InFIG. 2D, both of the first plane section 217 and the second planesection 227 surround the optical axis and are perpendicular to theannular surface of the optical axis. The one of the first plane section217 and the second plane section 227 with shorter annular width is thesecond plane section 227. A width midpoint of the second plane section227 forms a circle that regards the optical axis as a center, and thediameter thereof is ϕd.

Specifically, in FIG. 2B, during the assembling process of cementing thefirst lens element 210 and the second lens element 220 with thecementing glue coating 290, the first lens element 210 is firstly placedon a lens platform (not shown) with the first surface 213 facing anupward direction. Next, a non-solid cementing glue 299 whose volume hasbeen estimated is injected as a single drop to the center of the firstoptical effective portion 214. The second lens element 220 is engagedwith the second engaging structure 272 via the first engaging structure271 with the second surface 223 facing a downward direction, and a lightblocking sheet 240 is assembled between the first surface 213 and thesecond surface 223, such that the non-solid cementing glue 299compressed by the first lens element 210 and the second lens element 220radially spreads to the directions of the first peripheral portion 215and the second peripheral portion 225 from the center of the firstoptical effective portion 214 and the center of the second opticaleffective portion 224. The non-solid cementing glue 299 subsequentlyhardens to be the cementing glue coating 290 cementing the first lenselement 210 and the second lens element 220, such that the first lenselement 210 and the second lens element 220 are cemented with each otherto form a cemented lens element.

In FIG. 2B and FIG. 2C, the first engaging structure 271 includes afirst conical surface 281 and a first abutting area 291. The firstconical surface 281 is a conical annular surface regarding the opticalaxis as the central line. The first abutting area 291 is perpendicularto the optical axis and is farther away from the first optical effectiveportion 214 than the first conical surface 281 is thereto. The secondengaging structure 272 includes a second conical surface 282 and asecond abutting area 292. The second conical surface 282 is a conicalannular surface regarding the optical axis as the central line. Thesecond abutting area 292 is perpendicular to the optical axis and isfarther away from the second optical effective portion 224 than thesecond conical surface 282 is thereto. The first conical surface 281 iscontacted with the second conical surface 282, and the first abuttingarea 291 is contacted with the second abutting area 292 to engage thefirst engaging structure 271 with the second engaging structure 272 foraligning the first optical effective portion 214 with the second opticaleffective portion 224.

In FIG. 2A and FIG. 2C, the first spacing section 216 includes the firstplane section 217 which is perpendicular to the optical axis. The secondspacing section 226 includes the second plane section 227 which isperpendicular to the optical axis. Both of the first plane section 217and the second plane section 227 have no contact with the cementing gluecoating 290. Further, the reference space 280 can include the referencegap 288.

In FIG. 2B and FIG. 2C, the second spacing section 226 includes anannular groove 260 which corresponds to the near surface recess thereof.In other words, the annular groove 260 is included between the secondoptical effective portion 224 and the second plane section 227.

The first plane section 217 is connected with the first conical surface281, and the first conical surface 281 is connected with the firstabutting area 291. Meanwhile, the second plane section 227 is connectedwith the second conical surface 282, and the second conical surface 282is connected with the second abutting area 292.

In FIG. 2A, the plastic optical lens assembly 209 further includes alight blocking sheet 240 which is disposed between the first planesection 217 and the second plane section 227, or it can be said that thelight blocking sheet 240 is disposed in the reference gap 288. In onetime, one of the first plane section 217 and the second plane section227 receives the light blocking sheet 240, i.e., the distance d (a gapwidth of the reference gap 288) between the first plane section 217 andthe second plane section 227 is larger than the thickness of the lightblocking sheet 240. Therefore, the light blocking sheet 240 is looselydisposed in the reference gap 288, rather than the first plane section217 and the second plane section 227 being simultaneously against thelight blocking sheet 240 tightly. Hence, by placing the light blockingsheet 240 in the reference gap 288 between the first plane section 217and the second plane section 227, the light blocking sheet 240 can havea great configuration status in the cemented lens element to promote thelight blocking efficiency of the plastic optical lens assembly 209 andthe image quality of the imaging lens module 200. Additionally, thedimension of the light blocking sheet 240 can be adjusted to extend tothe reference space 280 beyond the reference gap 288 based on theoptical specification requirement.

In FIG. 2D, when the distance between the first plane section 217 andthe second plane section 227 is d and the thickness of the lightblocking sheet 240 is m, the following condition can be satisfied: 0.002mm<d−m<0.015 mm. Accordingly, in the precision range of the parameters dand m, the light blocking sheet 240 can be prevented from being overlyshaken and compressed by the first plane section 217 and the secondplane section 227, which facilitates to maintain the optical quality ofthe plastic optical lens assembly 209.

Please refer to the following Table 2, which lists the data definedbased on the aforementioned parameters ϕd, ϕt, (ϕd−ϕt)/2, ϕd-ϕt, θ, Ra,d, t, d/t, m, d−m, and 2 a (whose definitions are the same as those ofthe plastic optical lens assembly 109 of the imaging lens module 100 ofthe 1st embodiment) of the plastic optical lens assembly 209 of theimaging lens module 200 of the 2nd embodiment as illustrated in FIG. 2Bto FIG. 2D.

TABLE 2 2nd embodiment Φd (mm) 2.73 d (mm) 0.024 Φt (mm) 1.84 t (mm)0.03 (Φd − Φt)/2 (mm) 0.445 d/t 0.800 Φd − Φt (mm) 0.890 m (mm) 0.016 θ(degrees) 110 d − m (mm) 0.008 Ra (μm) 1.12-1.6 2a (mm²) 0.0714

3rd Embodiment

FIG. 3A is a schematic view of an imaging lens module 300 according tothe 3rd embodiment of the present disclosure. In FIG. 3A, the imaginglens module 300 includes a plastic optical lens assembly 309 and animage sensor 307, wherein the plastic optical lens assembly 309 includesa first lens element 310, a second lens element 320, and a cementingglue coating 390. The image sensor 307 is disposed on an image surface356 of the plastic optical lens assembly 309.

In the 3rd embodiment, the plastic optical lens assembly 309 includes,in order from an object side to an image side, the first lens element310, the second lens element 320, lens elements 333, 334, 335, 336, andthe image surface 356, wherein the plastic optical lens assembly 309 hassix lens elements (i.e., the first lens element 310, the second lenselement 320, the lens elements 333, 334, 335, 336), and all of the sixlens elements are plastic materials. The cementing glue coating 390cements the first lens element 310 and the second lens element 320, andall of the first lens element 310, the second lens element 320, the lenselements 333, 334, 335, and 336 are disposed inside the plastic barrel308 along an optical axis of the plastic optical lens assembly 309.

FIG. 3B is a schematic view of assembling the first lens element 310 andthe second lens element 320 according to the 3rd embodiment. In FIG. 3Aand FIG. 3B, the first lens element 310 includes a first surface 313.The first surface 313 includes a first optical effective portion 314 anda first peripheral portion 315, wherein the first peripheral portion 315surrounds the first optical effective portion 314. The second lenselement 320 includes a second surface 323. The second surface 323includes a second optical effective portion 324 and a second peripheralportion 325, wherein the second optical effective portion 324 isdisposed correspondingly to the first optical effective portion 314, andthe second peripheral portion 325 surrounds the second optical effectiveportion 324. In the 3rd embodiment, the first surface 313 is the surfaceof the first lens element 310 facing the image surface 356, and thefirst optical effective portion 314 convex in a paraxial region thereof.The second surface 323 is the surface of the second lens element 320facing an imaged object (not shown), and the second optical effectiveportion 324 is concave in a paraxial region thereof.

FIG. 3C is a schematic view of a parameter 2 a of the plastic opticallens assembly 309 according to the 3rd embodiment. In FIG. 3A and FIG.3C, the cementing glue coating 390 is disposed between the first opticaleffective portion 314 and the second optical effective portion 324, andthe cementing glue coating 390 cements the first lens element 310 andthe second lens element 320. That is, the first lens element 310 and thesecond lens element 320 are cemented to form a cemented lens element viacementing the first optical effective portion 314 and the second opticaleffective portion 324.

Specifically, in FIG. 3A and FIG. 3B, the first peripheral portion 315includes a first spacing section 316 and a first engaging structure 371.The first spacing section 316 is located between the first opticaleffective portion 314 and the first engaging structure 371. The secondperipheral portion 325 includes a second spacing section 326 and asecond engaging structure 372. The second spacing section 326 is locatedbetween the second optical effective portion 324 and the second engagingstructure 372, wherein the first engaging structure 371 is engaged withthe second engaging structure 372 for aligning the first opticaleffective portion 314 with the second optical effective portion 324, anda reference space 380 is formed between the first spacing section 316and the second spacing section 326, wherein the reference space 380 isan air gap between the first spacing section 316 and the second spacingsection 326.

In other words, the first peripheral portion 315 includes the firstplane section 317 and the first engaging structure 371. The first planesection 317 is perpendicular to the optical axis of the plastic opticallens assembly 309 and is located between the first optical effectiveportion 314 and the first engaging structure 371. The second peripheralportion 325 includes the second plane section 327 and the secondengaging structure 372. The second plane section 327 is perpendicular tothe optical axis and is located between the second optical effectiveportion 324 and the second engaging structure 372, wherein the firstengaging structure 371 is engaged with the second engaging structure 372for aligning the first optical effective portion 314 with the secondoptical effective portion 324, and a reference gap 388 is formed betweenthe first plane section 317 and the second plane section 327, whereinthe reference gap 388 is an air gap between the first plane section 317and the second plane section 327.

FIG. 3D is a schematic view of parameters ϕd, ϕt, d, and t of theplastic optical lens assembly 309 according to the 3rd embodiment. InFIG. 3D, both of the first plane section 317 and the second planesection 327 surround the optical axis and are perpendicular to theannular surface of the optical axis. The one of the first plane section317 and the second plane section 327 with shorter annular width is thesecond plane section 327. A width midpoint of the second plane section327 forms a circle that regards the optical axis as a center, and thediameter thereof is ϕd.

Specifically, in FIG. 3B, during the assembling process of cementing thefirst lens element 310 and the second lens element 320 with thecementing glue coating 390, the second lens element 320 is firstlyplaced on a lens platform (not shown) with the second surface 323 facingan upward direction. Next, a non-solid cementing glue 399 whose volumehas been estimated is injected as a single drop to the center of thesecond optical effective portion 324. The first lens element 310 isengaged with the second engaging structure 372 via the first engagingstructure 371 with the first surface 313 facing a downward direction,such that the non-solid cementing glue 399 compressed by the first lenselement 310 and the second lens element 320 radially spreads to thedirections of the first peripheral portion 315 and the second peripheralportion 325 from the center of the first optical effective portion 314and the center of the second optical effective portion 324. Thenon-solid cementing glue 399 subsequently hardens to be the cementingglue coating 390 cementing the first lens element 310 and the secondlens element 320, such that the first lens element 310 and the secondlens element 320 are cemented with each other to form a cemented lenselement.

In FIG. 3B and FIG. 3C, the first engaging structure 371 includes afirst conical surface 381 and a first abutting area 391. The firstconical surface 381 is a conical annular surface regarding the opticalaxis as the central line. The first abutting area 391 is perpendicularto the optical axis and is farther away from the first optical effectiveportion 314 than the first conical surface 381 is thereto. The secondengaging structure 372 includes a second conical surface 382 and asecond abutting area 392. The second conical surface 382 is a conicalannular surface regarding the optical axis as the central line. Thesecond abutting area 392 is perpendicular to the optical axis and isfarther away from the second optical effective portion 324 than thesecond conical surface 382 is thereto. The first conical surface 381 iscontacted with the second conical surface 382, and the first abuttingarea 391 is contacted with the second abutting area 392 to engage thefirst engaging structure 371 with the second engaging structure 372 foraligning the first optical effective portion 314 with the second opticaleffective portion 324.

In FIG. 3A and FIG. 3C, the first spacing section 316 includes the firstplane section 317 which is perpendicular to the optical axis. The secondspacing section 326 includes the second plane section 327 which isperpendicular to the optical axis. Both of the first plane section 317and the second plane section 327 have no contact with the cementing gluecoating 390. Further, the reference space 380 includes the reference gap388.

In FIG. 3B and FIG. 3C, the second spacing section 326 includes anannular groove 360 which corresponds to the near surface recess thereof.In other words, the annular groove 360 is included between the secondoptical effective portion 324 and the second plane section 327.

The first plane section 317 is connected with the first conical surface381, and the first conical surface 381 is connected with the firstabutting area 391. Meanwhile, the second plane section 327 is connectedwith the second conical surface 382, and the second conical surface 382is connected with the second abutting area 392.

Please refer to the following Table 3, which lists the data definedbased on the aforementioned parameters ϕd, ϕt, (ϕd−ϕt)/2, ϕd−ϕt, θ, Ra,d, t, d/t, and 2 a (whose definitions are the same as those of theplastic optical lens assembly 109 of the imaging lens module 100 of the1st embodiment) of the plastic optical lens assembly 309 of the imaginglens module 300 of the 3rd embodiment as illustrated in FIG. 3B to FIG.3D.

TABLE 3 3rd embodiment Φd (mm) 2.79 Ra (μm) 0.4-0.8 Φt (mm) 2.18 d (mm)0.057 (Φd − Φt)/2 (mm) 0.305 t (mm) 0.03 Φd − Φt (mm) 0.610 d/t 1.900 θ(degrees) 110 2a (mm²) 0.0606

4th Embodiment

FIG. 4A is a schematic view of an imaging lens module 400 according tothe 4th embodiment of the present disclosure. In FIG. 4A, the imaginglens module 400 includes a plastic optical lens assembly 409 and animage sensor 407, wherein the plastic optical lens assembly 409 includesa first lens element 410, a second lens element 420, a cementing gluecoating 490, a first lens element 910, a second lens element 920, and acementing glue coating 990. The image sensor 407 is disposed on an imagesurface 456 of the plastic optical lens assembly 409.

In the 4th embodiment, the plastic optical lens assembly 409 includes,in order from an object side to an image side, the first lens element410, the second lens element 420, a lens element 433, the first lenselement 910, the second lens element 920, a lens element 434, and theimage surface 456, wherein the plastic optical lens assembly 409 has sixlens elements (i.e., the first lens element 410, the second lens element420, the lens element 433, the first lens element 910, the second lenselement 920, and the lens element 434), and all of the 6 lens elementsare plastic materials. The cementing glue coating 490 cements the firstlens element 410 and the second lens element 420, the cementing gluecoating 990 cements the first lens element 910 and the second lenselement 920, and all of the first lens element 410, the second lenselement 420, the lens element 433, the first lens element 910, thesecond lens element 920, and the lens element 434 are disposed insidethe plastic barrel 408 along an optical axis of the plastic optical lensassembly 409.

The cemented lens element formed by the first lens element 410 and thesecond lens element 420 will be firstly discussed. FIG. 4B is aschematic view of assembling the first lens element 410 and the secondlens element 420 according to the 4th embodiment. In FIG. 4A and FIG.4B, the first lens element 410 includes a first surface 413. The firstsurface 413 includes a first optical effective portion 414 and a firstperipheral portion 415, wherein the first peripheral portion 415surrounds the first optical effective portion 414. The second lenselement 420 includes a second surface 423. The second surface 423includes a second optical effective portion 424 and a second peripheralportion 425, wherein the second optical effective portion 424 isdisposed correspondingly to the first optical effective portion 414, andthe second peripheral portion 425 surrounds the second optical effectiveportion 424. In the 4th embodiment, the first surface 413 is the surfaceof the first lens element 410 facing the image surface 456, and thefirst optical effective portion 414 is convex in a paraxial regionthereof. The second surface 423 is the surface of the second lenselement 420 facing an imaged object (not shown), and the second opticaleffective portion 424 is concave in a paraxial region thereof.

FIG. 4C is a schematic view of a parameter 2 a of the plastic opticallens assembly 409 according to the 4th embodiment. In FIG. 4A and FIG.4C, the cementing glue coating 490 is disposed between the first opticaleffective portion 414 and the second optical effective portion 424, andthe cementing glue coating 490 cements the first lens element 410 andthe second lens element 420. That is, the first lens element 410 and thesecond lens element 420 are cemented to form the cemented lens elementvia cementing the first optical effective portion 414 and the secondoptical effective portion 424.

Specifically, in FIG. 4A and FIG. 4B, the first peripheral portion 415includes a first spacing section 416 and a first engaging structure 471.The first spacing section 416 is located between the first opticaleffective portion 414 and the first engaging structure 471. The secondperipheral portion 425 includes a second spacing section 426 and asecond engaging structure 472. The second spacing section 426 is locatedbetween the second optical effective portion 424 and the second engagingstructure 472, wherein the first engaging structure 471 is engaged withthe second engaging structure 472 for aligning the first opticaleffective portion 414 with the second optical effective portion 424, anda reference space 480 is formed between the first spacing section 416and the second spacing section 426, wherein the reference space 480 isan air gap between the first spacing section 416 and the second spacingsection 426.

In other words, the first peripheral portion 415 includes the firstplane section 417 and the first engaging structure 471. The first planesection 417 is perpendicular to the optical axis of the plastic opticallens assembly 409 and is located between the first optical effectiveportion 414 and the first engaging structure 471. The second peripheralportion 425 includes the second plane section 427 and the secondengaging structure 472. The second plane section 427 is perpendicular tothe optical axis and is located between the second optical effectiveportion 424 and the second engaging structure 472, wherein the firstengaging structure 471 is engaged with the second engaging structure 472for aligning the first optical effective portion 414 with the secondoptical effective portion 424, and a reference gap 488 is formed betweenthe first plane section 417 and the second plane section 427, whereinthe reference gap 488 is an air gap between the first plane section 417and the second plane section 427.

FIG. 4D is a schematic view of parameters ϕd, ϕt, d, and t of theplastic optical lens assembly 409 according to the 4th embodiment. InFIG. 4D, both of the first plane section 417 and the second planesection 427 surround the optical axis and are perpendicular to theannular surface of the optical axis. The one of the first plane section417 and the second plane section 427 with shorter annular width is thesecond plane section 427. A width midpoint of the second plane section427 forms a circle that regards the optical axis as a center, and thediameter thereof is ϕd.

Specifically, in FIG. 4B, during the assembling process of cementing thefirst lens element 410 and the second lens element 420 with thecementing glue coating 490, the second lens element 420 is firstlyplaced on a lens platform (not shown) with the second surface 423 facingan upward direction. Next, a non-solid cementing glue 499 whose volumehas been estimated is injected as a single drop to the center of thesecond optical effective portion 424. The first lens element 410 isengaged with the second engaging structure 472 via the first engagingstructure 471 with the first surface 413 facing a downward direction,such that the non-solid cementing glue 499 compressed by the first lenselement 410 and the second lens element 420 radially spreads to thedirections of the first peripheral portion 415 and the second peripheralportion 425 from the center of the first optical effective portion 414and the center of the second optical effective portion 424. Thenon-solid cementing glue 499 subsequently hardens to be the cementingglue coating 490 cementing the first lens element 410 and the secondlens element 420, such that the first lens element 410 and the secondlens element 420 are cemented with each other to form the cemented lenselement.

In FIG. 4B and FIG. 4C, the first engaging structure 471 includes afirst conical surface 481 and a first abutting area 491. The firstconical surface 481 is a conical annular surface regarding the opticalaxis as the central line. The first abutting area 491 is perpendicularto the optical axis and is farther away from the first optical effectiveportion 414 than the first conical surface 481 is thereto. The secondengaging structure 472 includes a second conical surface 482 and asecond abutting area 492. The second conical surface 482 is a conicalannular surface regarding the optical axis as the central line. Thesecond abutting area 492 is perpendicular to the optical axis and isfarther away from the second optical effective portion 424 than thesecond conical surface 482 is thereto. The first conical surface 481 iscontacted with the second conical surface 482, and the first abuttingarea 491 is contacted with the second abutting area 492 to engage thefirst engaging structure 471 with the second engaging structure 472 foraligning the first optical effective portion 414 with the second opticaleffective portion 424.

In FIG. 4A and FIG. 4C, the first spacing section 416 includes the firstplane section 417 which is perpendicular to the optical axis. The secondspacing section 426 includes the second plane section 427 which isperpendicular to the optical axis. Both of the first plane section 417and the second plane section 427 have no contact with the cementing gluecoating 490. Further, the reference space 480 includes the reference gap488.

In FIG. 4B and FIG. 4C, the second spacing section 426 includes anannular groove 460 which corresponds to the near surface recess thereof.In other words, the annular groove 460 is included between the secondoptical effective portion 424 and the second plane section 427.

The first plane section 417 is connected with the first conical surface481, and the first conical surface 481 is connected with the firstabutting area 491. Meanwhile, the second plane section 427 is connectedwith the second conical surface 482, and the second conical surface 482is connected with the second abutting area 492.

Please refer to the following Table 4-1, which lists the data definedbased on the aforementioned parameters ϕd, ϕt, (ϕd−ϕt)/2, ϕd−ϕt, θ, Ra,d, t, d/t, and 2 a (whose definitions are the same as those of theplastic optical lens assembly 109 of the imaging lens module 100 of the1st embodiment) of the first lens element 410 and the second lenselement 420 of the imaging lens module 400 of the 4th embodiment asillustrated in FIG. 4B to FIG. 4D.

TABLE 4-1 the first lens element 410 and the second lens element 420 ofthe 4th embodiment Φd (mm) 2.79 Ra (μm) 0.4-0.8 Φt (mm) 2.18 d (mm)0.057 (Φd − Φt)/2 (mm) 0.305 t (mm) 0.03 Φd − Φt (mm) 0.610 d/t 1.900 θ(degrees) 110 2a (mm²) 0.0606

Next, the cemented lens element formed by the first lens element 910 andthe second lens element 920 will be discussed. FIG. 4E is anotherschematic view of the imaging lens module 400 according to the 4thembodiment of the present disclosure; FIG. 4F is a schematic view ofassembling the first lens element 910 and the second lens element 920according to the 4th embodiment. In FIG. 4E and FIG. 4F, the first lenselement 910 includes a first surface 913. The first surface 913 includesa first optical effective portion 914 and a first peripheral portion915, wherein the first peripheral portion 915 surrounds the firstoptical effective portion 914. The second lens element 920 includes asecond surface 923. The second surface 923 includes a second opticaleffective portion 924 and a second peripheral portion 925, wherein thesecond optical effective portion 924 is disposed correspondingly to thefirst optical effective portion 914, and the second peripheral portion925 surrounds the second optical effective portion 924. In the 4thembodiment, the first surface 913 is the surface of the first lenselement 910 facing the image surface 456, and the first opticaleffective portion 914 is convex in a paraxial region thereof. The secondsurface 923 is the surface of the second lens element 920 facing animaged object (not shown), and the second optical effective portion 924is concave in a paraxial region thereof.

FIG. 4G is another schematic view of a parameter 2 a of the plasticoptical lens assembly 409 according to the 4th embodiment. In FIG. 4Eand FIG. 4G, the cementing glue coating 990 is disposed between thefirst optical effective portion 914 and the second optical effectiveportion 924, and the cementing glue coating 990 cements the first lenselement 910 and the second lens element 920. That is, the first lenselement 910 and the second lens element 920 are cemented to form thecemented lens element via cementing the first optical effective portion914 and the second optical effective portion 924.

Specifically, in FIG. 4E and FIG. 4F, the first peripheral portion 915includes a first spacing section 916 and a first engaging structure 971.The first spacing section 916 is located between the first opticaleffective portion 914 and the first engaging structure 971. The secondperipheral portion 925 includes a second spacing section 926 and asecond engaging structure 972. The second spacing section 926 is locatedbetween the second optical effective portion 924 and the second engagingstructure 972, wherein the first engaging structure 971 is engaged withthe second engaging structure 972 for aligning the first opticaleffective portion 914 with the second optical effective portion 924, anda reference space 980 is formed between the first spacing section 916and the second spacing section 926, wherein the reference space 980 isan air gap between the first spacing section 916 and the second spacingsection 926.

In other words, the first peripheral portion 915 includes the firstplane section 917 and the first engaging structure 971. The first planesection 917 is perpendicular to the optical axis of the plastic opticallens assembly 409 and is located between the first optical effectiveportion 914 and the first engaging structure 971. The second peripheralportion 925 includes the second plane section 927 and the secondengaging structure 972. The second plane section 927 is perpendicular tothe optical axis and is located between the second optical effectiveportion 924 and the second engaging structure 972, wherein the firstengaging structure 971 is engaged with the second engaging structure 972for aligning the first optical effective portion 914 with the secondoptical effective portion 924, and a reference gap 988 is formed betweenthe first plane section 917 and the second plane section 927, whereinthe reference gap 988 is an air gap between the first plane section 917and the second plane section 927.

FIG. 4H is another schematic view of parameters ϕd, ϕt, d, and t of theplastic optical lens assembly 409 according to the 4th embodiment and aschematic view of a parameter m. In FIG. 4H, both of the first planesection 917 and the second plane section 927 surround the optical axisand are perpendicular to the annular surface of the optical axis. Theone of the first plane section 917 and the second plane section 927 withshorter annular width is the second plane section 927. A width midpointof the second plane section 927 forms a circle that regards the opticalaxis as a center, and the diameter thereof is ϕd.

Specifically, in FIG. 4F, during the assembling process of cementing thefirst lens element 910 and the second lens element 920 with thecementing glue coating 990, the second lens element 920 is firstlyplaced on a lens platform (not shown) with the second surface 923 facingan upward direction. Next, a non-solid cementing glue 999 whose volumehas been estimated is injected as a single drop to the center of thesecond optical effective portion 924. The first lens element 910 isengaged with the second engaging structure 972 via the first engagingstructure 971 with the first surface 913 facing a downward direction,and a light blocking sheet 940 is assembled between the first surface913 and the second surface 923, such that the non-solid cementing glue999 compressed by the first lens element 910 and the second lens element920 radially spreads to the directions of the first peripheral portion915 and the second peripheral portion 925 from the center of the firstoptical effective portion 914 and the center of the second opticaleffective portion 924. The non-solid cementing glue 999 subsequentlyhardens to be the cementing glue coating 990 cementing the first lenselement 910 and the second lens element 920, such that the first lenselement 910 and the second lens element 920 are cemented with each otherto form the cemented lens element.

In FIG. 4F and FIG. 4G, the first engaging structure 971 includes afirst conical surface 981 and a first abutting area 991. The firstconical surface 981 is a conical annular surface regarding the opticalaxis as the central line. The first abutting area 991 is perpendicularto the optical axis and is farther away from the first optical effectiveportion 914 than the first conical surface 981 is thereto. The secondengaging structure 972 includes a second conical surface 982 and asecond abutting area 992. The second conical surface 982 is a conicalannular surface regarding the optical axis as the central line. Thesecond abutting area 992 is perpendicular to the optical axis and isfarther away from the second optical effective portion 924 than thesecond conical surface 982 is thereto. The first conical surface 981 iscontacted with the second conical surface 982, and the first abuttingarea 991 is contacted with the second abutting area 992 to engage thefirst engaging structure 971 with the second engaging structure 972 foraligning the first optical effective portion 914 with the second opticaleffective portion 924.

In FIG. 4E and FIG. 4G, the first spacing section 916 includes the firstplane section 917 which is perpendicular to the optical axis. The secondspacing section 926 includes the second plane section 927 which isperpendicular to the optical axis. Both of the first plane section 917and the second plane section 927 have no contact with the cementing gluecoating 990. Further, the reference space 980 includes the reference gap988.

In FIG. 4F and FIG. 4G, the second spacing section 926 includes anannular groove 960 which corresponds to the near surface recess thereof.In other words, the annular groove 960 is included between the secondoptical effective portion 924 and the second plane section 927.

The first plane section 917 is connected with the first conical surface981, and the first conical surface 981 is connected with the firstabutting area 991. Meanwhile, the second plane section 927 is connectedwith the second conical surface 982, and the second conical surface 982is connected with the second abutting area 992.

In FIG. 4E, the plastic optical lens assembly 409 further includes thelight blocking sheet 940 which is disposed between the first planesection 917 and the second plane section 927, or it can also be saidthat the light blocking sheet 940 is disposed in the reference gap 988,wherein in one time, one of the first plane section 917 and the secondplane section 927 receives the light blocking sheet 940.

Please refer to the following Table 4-2, which lists the data definedbased on the aforementioned parameters ϕd, ϕt, (ϕd−ϕt)/2, ϕd−ϕt, θ, Ra,d, t, d/t, m, d−m, and 2 a (whose definitions are the same as those ofthe plastic optical lens assembly 109 of the imaging lens module 100 ofthe 1st embodiment and the plastic optical lens assembly 209 of theimaging lens module 200 of the 2nd embodiment) of the first lens element910 and the second lens element 920 of the imaging lens module 400 ofthe 4th embodiment as illustrated in FIG. 4F to FIG. 4H.

TABLE 4-2 the first lens element 910 and the second lens element 920 ofthe 4th embodiment Φd (mm) 3.32 d (mm) 0.027 Φt (mm) 2.11 t (mm) 0.024(Φd − Φt)/2 (mm) 0.605 d/t 1.125 Φd − Φt (mm) 1.210 m (mm) 0.023 θ(degrees) 110 d − m (mm) 0.004 Ra (μm) 2.24-3.15 2a (mm²) 0.1042

5th Embodiment

FIG. 5A is a schematic view of an electronic device 50 of the 5thembodiment of the present disclosure, FIG. 5B is another schematic viewof the electronic device 50 of the 5th embodiment of the presentdisclosure, and particularly, FIG. 5A and FIG. 5B are schematic views ofa camera of the electronic device 50. In FIG. 5A and FIG. 5B, theelectronic device 50 of the 5th embodiment is a smart phone whichincludes the imaging lens module 500 of the present disclosure. Theimaging lens module 500 includes the plastic optical lens assembly 509according to the present disclosure and an image sensor 507, wherein theimage sensor 507 is disposed on an image surface of the plastic opticallens assembly 509. Accordingly, a better image quality can be achieved,and hence the high specification of imaging requirement of modernelectronic devices can be satisfied.

Specifically, the user activates the capturing mode via the userinterface 59 of the electronic device 50, wherein the user interface 59of the 5th embodiment can be a touch screen 59 a, a button 59 b, etc. Atthis moment, the plastic optical lens assembly 509 of the imaging lensmodule 500 collects imaging lights on the image sensor 507 and outputselectronic signals associated with images to an image signal processor(ISP) 58.

FIG. 5C is a block diagram of the electronic device 50 of the 5thembodiment, in particular, the block diagram of the camera of theelectronic device 50. In FIG. 5A to FIG. 50 , the imaging lens module500 can further include an auto focus component 503 and an opticalanti-shake component 504 in response to the camera specification of theelectronic device 50 in response to the camera specification of theelectronic device 50. Moreover, the electronic device 50 can furtherinclude at least one auxiliary optical element 57 and at least onesensing element 56. The auxiliary optical element 57 can be flashmodules, infrared distance measurement components, laser focus modulesand modules for compensating for color temperatures. The sensing element56 can have functions for sensing physical momentum and kineticenergies, such as an accelerator, a gyroscope, and a hall effectelement, to sense shaking or jitters applied by hands of the user orexternal environments. As a result, the auto focus component 503 and theoptical anti-shake component 504 disposed on the electronic device 50can function to obtain great imaging qualities and facilitate theelectronic device 50 according to the present disclosure to have acapturing function with multiple modes, such as taking optimizedselfies, high dynamic range (HDR) with a low light source, 4K resolutionrecording, etc. Additionally, the user can visually see the capturedimage of the camera through the touch screen and manually operate theview finding range on the touch screen to achieve the auto focusfunction of what you see is what you get.

Furthermore, in FIG. 5B, the imaging lens module 500, the sensingelement 56, and the auxiliary optical element 57 can be disposed on aflexible printed circuitboard (FPC) 97 and electrically connected withthe associated elements, such as an imaging signal processing element58, via a connector 98 to perform a capturing process. Since the currentelectronic devices, such as smartphones, have a tendency of being lightand thin, the way of firstly disposing the imaging lens module andrelated elements on the flexible printed circuitboard and secondlyintegrating the circuit into the main board of the electronic device viathe connector can satisfy the mechanical design of the limited spaceinside the electronic device and the layout requirements and obtain moremargins. The auto focus function of the imaging lens module can becontrolled more flexibly via the touch screen of the electronic device.In the 5th embodiment, the electronic device 50 includes a plurality ofsensing elements 56 and a plurality of auxiliary optical elements 57.The sensing elements 56 and the auxiliary optical elements 57 aredisposed on the flexible printed circuitboard 97 and at least one otherflexible printed circuitboard (not labelled particularly) andelectrically connected with the associated elements, such as an imagingsignal processing element 58, via corresponding connectors to perform acapturing process. In other embodiments (not shown), the sensingelements and the auxiliary optical elements can also be disposed on themain board of the electronic device or carrier boards in other formsaccording to requirements of the mechanical design and the circuitlayout.

In addition, the electronic device 50 can further include, but not belimited to, a display, a control unit, a storage unit, a random accessmemory, a read-only memory, or the combination thereof.

6th Embodiment

FIG. 6 is a schematic view of an electronic device 60 according to the6th embodiment of the present disclosure. The electronic device 60 ofthe 6th embodiment is a tablet, and the electronic device 60 includes animaging lens module 600 which includes a plastic optical lens assembly(not shown) according to the present disclosure and an image sensor (notshown), wherein the image sensor is disposed on an image surface (notshown) of the plastic optical lens assembly.

7th Embodiment

FIG. 7 is a schematic view of an electronic device 70 according to the7th embodiment of the present disclosure. The electronic device 70 ofthe 7th embodiment is a wearable device, and the electronic device 70includes an imaging lens module 700 which includes a plastic opticallens assembly (not shown) according to the present disclosure and animage sensor (not shown), wherein the image sensor is disposed on animage surface (not shown) of the plastic optical lens assembly.

Although the present disclosure has been described in considerabledetail with reference to certain embodiments thereof, other embodimentsare possible. Therefore, the spirit and scope of the appended claimsshould not be limited to the description of the embodiments containedherein. It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentdisclosure without departing from the scope or spirit of the disclosure.In view of the foregoing, it is intended that the present disclosurecover modifications and variations of this disclosure provided they fallwithin the scope of the following claims.

What is claimed is:
 1. A plastic optical lens assembly, comprising: afirst lens element comprising a first surface, wherein the first surfacecomprises: a first optical effective portion; and a first peripheralportion surrounding the first optical effective portion, wherein thefirst peripheral portion comprises a first plane section and a firstengaging structure, and the first plane section is perpendicular to anoptical axis of the plastic optical lens assembly and is located betweenthe first optical effective portion and the first engaging structure; asecond lens element comprising a second surface, wherein the secondsurface comprises: a second optical effective portion disposedcorrespondingly to the first optical effective portion; and a secondperipheral portion surrounding the second optical effective portion,wherein the second peripheral portion comprises a second plane sectionand a second engaging structure, the second plane section isperpendicular to the optical axis and is located between the secondoptical effective portion and the second engaging structure, the firstengaging structure is engaged with the second engaging structure foraligning the first optical effective portion with the second opticaleffective portion, and a reference gap is formed between the first planesection and the second plane section; and a cementing glue coating beingat least disposed between the first optical effective portion and thesecond optical effective portion, and the cementing glue coatingcementing the first lens element and the second lens element; wherein adiameter of a width midpoint of one of the first plane section and thesecond plane section having a narrower width is ϕd, an outer diameter ofthe cementing glue coating is ϕt, and the following condition issatisfied:0.08 mm<(ϕd−ϕt)/2<ϕt mm.
 2. The plastic optical lens assembly of claim1, wherein the first engaging structure comprises a first conicalsurface and a first abutting area, and the first abutting area isperpendicular to the optical axis and is farther away from the firstoptical effective portion than the first conical surface is thereto;wherein the second engaging structure comprises a second conical surfaceand a second abutting area, wherein the second abutting area isperpendicular to the optical axis and is farther away from the secondoptical effective portion than the second conical surface is thereto,and the first conical surface is contacted with the second conicalsurface, the first abutting area is contacted with the second abuttingarea.
 3. The plastic optical lens assembly of claim 2, wherein anannular groove is comprised between the first optical effective portionand the first plane section or between the second optical effectiveportion and the second plane section, or two annular grooves arecomprised between the first optical effective portion and the firstplane section and between the second optical effective portion and thesecond plane section, respectively.
 4. The plastic optical lens assemblyof claim 3, wherein both of the first plane section and the second planesection have no contact with the cementing glue coating.
 5. The plasticoptical lens assembly of claim 4, wherein a surface roughness of theannular groove is Ra, and the following condition is satisfied:0.1 μm<Ra<4.0 μm.
 6. The plastic optical lens assembly of claim 1,wherein the diameter of the width midpoint of one of the first planesection and the second plane section having the narrower width is ϕd,the outer diameter of the cementing glue coating is ϕt, and thefollowing condition is satisfied:0.16 mm<ϕd−ϕt<ϕt mm.
 7. The plastic optical lens assembly of claim 1,wherein a distance between the first plane section and the second planesection is d, a thickness of the cementing glue coating on the opticalaxis is t, and the following condition is satisfied:0.25<d/t<4.0.
 8. The plastic optical lens assembly of claim 1, wherein adistance between the first plane section and the second plane section isd, and the following condition is satisfied:0.002 mm<d<0.06 mm.
 9. An imaging lens module, comprising: the plasticoptical lens assembly of claim 1; and an image sensor disposed on animage surface of the plastic optical lens assembly.
 10. An electronicdevice, comprising: the imaging lens module of claim 9.